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METHODOLOGY FOR APPLICATION OF ELECTRIC AND ELECTROMAGNETIC BOREHOLE TECHNIQUES FOR DETAILED EXPLORATION OF FRACTURED ROCKS.

Objective

THE AIM OF THE RESEARCH WORK IS FIRST TO COMPLETE THE TECHNICAL DEVELOPMENTS OF THREE BOREHOLE GEOPHYSICAL METHODS FOR WHICH PROTOTYPES HAVE BEEN BUILT, AND SECOND TO DEVELOP A METHODOLOGY FOR THESE TOOLS APPLIED TO DETAILED INVESTIGATION OF FRACTURES.

THESE TOOLS ARE:
- ELIAS, AN ELECTRICAL IMAGING TECHNIQUE TO INVESTIGATE THE BOREHOLE WALL AND DETERMINE THE DEPTH, STRIKE AND DIP OF CONDUCTIVE OR RESISTIVE FRACTURES
- ROMULUS-ERIC, A SET OF INDUCTION TRANSMITTER-RECEIVER PROBES TO POINT OUT CONDUCTIVE FRACTURES AND MEASURE THEIR CONDUCTANCE WITH A ONE TO A TEN METERS RADIUS OF INVESTIGATION
- ARLETT, A THREE AXIS INDUCTION RECEIVER USED TOGETHER WITH A SURFACE ELECTROMAGNETIC TRANSMITTER, TO HELP ASSESS THE GEOMETRY OF THE MORE CONDUCTIVE FRACTURES IN A TEN TO ONE HUNDRED METERS RANGE.

THE FIRST AND THIRD SYSTEMS ARE STILL IN THE TECHNICAL DEVELOPMENT STAGE WHILE THE SECOND IN NOW OPERATIONNAL.NUMERICAL MODELLING OF THE METHODS IN NEEDED TO FULLY ASSESS THEIR CAPABILITIES.

1. TECHNICAL AND THEORETICAL DEVELOPMENT OF ELECTRIC AND ELECTROMAGNETIC PROBES.
1.1. ELIAS
1.1.1. FINAL STEP OF PROTOTYPE DEVELOPMENT
1.1.2. DESIGN OF DATA ACQUISITION AND PROCESSING SOFTWARE
1.2. ROMULUS-ERIC
1.2.1. DESIGN OF MODELLING SOFTWARE FOR THIN SHEET CONDUCTORS
1.2.2. SET UP OF A CATALOG OF THEORETICAL RESPONSE CURVES
1.2.3. STUDY OF COMPLEX GEOMETRY OF THIN CONDUCTORS
1.3. ARLETT
1.3.1. STUDY OF IMPROVEMENTS TO BE MADE IN THE PROBE DESIGN
1.3.2. DEVELOPMENT OF A NEW PROTOTYPE
1.3.3. NUMERICAL MODELLING

2. FIELD TESTS AND METHODOLOGICAL STUDIES
2.1. TECHNICAL FIELD TESTS OF ELIAS AND ARLETT
2.2. METHODOLOGY FOR DETAILED EXPLORATION OF FRACTURED ROCKS
2.2.1. DATA ACQUISITION ON AVAILABLE TEST SITES
2.2.2. DATA PROCESSING AND INTERPRETATION
2.2.3. ANALYSIS OF RESULTS AND METHODOLOGY ASSESSMENT

Topic(s)

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Call for proposal

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Coordinator

Bureau de Recherches Géologiques et Minières (BRGM)
EU contribution
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Address
39-43 Quai André Citroën
75739 Paris
France

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